Fixed FlowerGun AddRelativeForce

[tiagosomda]

The bullet flower in the flower gun is not working.
It always shoots the flower to the same direction.

That is due to a regression in the Untiy Physics Engine.
They are aware of the bug:
https://issuetracker.unity3d.com/issues/auto-sync-transforms-does-not-sync-correctly-when-using-addrelativeforce

However this fix is not even on 2018.1 beta yet.
So it would be nice to add this fix to NewtonVR.
Adding Physics.SyncTransforms() flushes any rotations to the physics engine which then applies the new rotation of the flower and makes it go the right way.

[tiagosomda]

Note that we can also fix this without calling the Physics.SyncTransform()
by changing the BulletForce to a float (instead of a Vector3) and adding the force like this:

bullet.GetComponent().AddForce(bullet.transform.forward*BulletForce);

[BernsteinA]

@tiagosomda is this still necessary?

[tiagosomda]

I haven't tried it recently.

However, Unity says they have fixed the bug on their side:
https://issuetracker.unity3d.com/issues/auto-sync-transforms-does-not-sync-correctly-when-using-addrelativeforce